TD stands for “Time Division Duplex”, and uses an unpaired spectrum that evolved from TD-SCDMA.
Transmission and reception occur in the same channel (“duplex”) and the uplink (“UL”) and downlink (“DL”) capacity ratio can be dynamically changed, which is convenient for mobile Internet use for example because a customer can use more of the bandwidth available for either downloading or uploading depending on what he needs to do. This is also very much applicable to fixed wireless usage in the enterprise, where traffic is typically and similarly asymmetric.
With DL/UL flexibility and lower latency, TDD enables a more stable user experience. Typical downlink traffic for video, web browsing, SNS and P2P services are 37, 9, 4 and 2 times the uplink traffic, respectively. Thanks to its flexibility, TDD LTE can provide six times the throughput for download than for upload, making it ideal for real world enterprise applications.
The challenge with LTE will always come down to the available capacity per user. While it is a silver bullet in terms of providing coverage, as cells reach capacity the services will degenerate as the number of users increases per cell site. The only way to get around this problem is to increase cell site density. By creating smaller LTE cells, servicing fewer users per cell, service providers can maintain higher peak throughputs, with the higher service levels typically required for enterprise applications.
Hybrid wireless access architectures present a compelling solution to extend last mile connectivity. These solutions typically have much lower installation and operating costs than fibre, and are quicker to install - meaning operators can redeem profits faster, can accommodate difficult terrain and atmospheric conditions, cover large areas, and are highly flexible. In fact, multi-gigabit point-to-multipoint broadband wireless access solutions can extend coverage from fibre end points or base stations with wireless line-of-sight radio links to more than 10km2. When combined with a TDD-LTE network, the cost per user/ business can go down dramatically.
- Scalable, multi-gigabit capacity, enabling service providers to easily increase their range of services, coverage area, and acquire more customers
- 100 Mbps to the premises (configurable), IPTV & VoIP service ready
- Accelerated residential and enterprise deployment once coverage area is created
- Carrier grade traffic management enabling stellar quality of service
- Accelerated time to positive cash flow